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Revenue - Energy Segment Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 444,770 $ 368,672 $ 1,315,285 $ 1,063,597
Net revenue 501,356 $ 406,409 1,451,825 $ 1,175,629
Energy        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 4,180   12,351  
RNG Incentives 285   1,027  
Alternative Fuel Tax Credit 64   2,640  
Other revenue 32   123  
Net revenue 4,561   16,141  
Volume-related | Energy        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 4,160   12,283  
Maintenance services | Energy        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 20   $ 68